Login to app.mangovoice.com as an Admin user
Select the Admin tab on the bottom left corner of the page
Select Extensions

Select Virtual Fax

Select the Add Virtual Fax Machine button

Enter the desired name for the Virtual Fax
Enter the desired number to associate with the Virtual Fax
Enter the desired email to be notified of incoming faxes
Select the blue Create Virtual Fax Machine box
Example:

The secure fax toggle button will appear after Virtual Fax creation

Note: The Secure Fax option under the Receiving Options section will become available after you initially create the virtual fax machine. The virtual fax is only intended for receiving faxes.
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